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kangaroo.js

'use strict';

const fs = require('fs');

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
    inputString += inputStdin;
});

process.stdin.on('end', _ => {
    inputString = inputString.replace(/\s*$/, '')
        .split('\n')
        .map(str => str.replace(/\s*$/, ''));

    main();
});

function readLine() {
    return inputString[currentLine++];
}

// Complete the kangaroo function below.
function kangaroo(x1, v1, x2, v2) {


    return v1 > v2 && (x2 - x1) % (v1 - v2) === 0 ? 'YES' : 'NO'


}

function main() {
    const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

    const x1V1X2V2 = readLine().split(' ');

    const x1 = parseInt(x1V1X2V2[0], 10);

    const v1 = parseInt(x1V1X2V2[1], 10);

    const x2 = parseInt(x1V1X2V2[2], 10);

    const v2 = parseInt(x1V1X2V2[3], 10);

    let result = kangaroo(x1, v1, x2, v2);

    ws.write(result + "\n");

    ws.end();
}